posix: Consolidate Linux fsync syscall

This patch consolidates the fsync Linux syscall generation on
sysdeps/unix/sysv/linux/fsync.c.  It basically removes it from
architectures auto-generation list.

For arm it also removes the __errno_location call since fsync
is not called with SYSCALL_CANCEL with call arch-specific
INLINE_SYSCALL macro which in turn will call __set_errno macro
(and setting errno directly).

Checked on i686-linux-gnu, x86_64-linux-gnu, x86_64-linux-gnux32,
arch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu,
sparc64-linux-gnu, and sparcv9-linux-gnu.

	* misc/Makefile (CFLAGS-fsync.c): New flag.
	* nptl/Makefile (CFLAGS-fsync.c): Likewise.
	* sysdeps/unix/syscalls.list (fsync): Remove from auto-generation
	syscall list.
	* sysdeps/unix/sysv/linux/fsync.c: New file.
	* sysdeps/unix/sysv/linux/arm/localplt.data [libpthread.so]
	(__errno_location): Remove.

6 files changed, 38 insertions, 2 deletions

diff --git a/ChangeLog b/ChangeLog
index 6e88eeffea..b04b779ef7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2017-05-18  Adhemerval Zanella  <adhemerval.zanella@linaro.org>
 
+	* misc/Makefile (CFLAGS-fsync.c): New flag.
+	* nptl/Makefile (CFLAGS-fsync.c): Likewise.
+	* sysdeps/unix/syscalls.list (fsync): Remove from auto-generation
+	syscall list.
+	* sysdeps/unix/sysv/linux/fsync.c: New file.
+	* sysdeps/unix/sysv/linux/arm/localplt.data [libpthread.so]
+	(__errno_location): Remove.
+
 	* misc/Makefile (CFLAGS-fdatasync.c): New rule.
 	* nptl/Makefile (CFLAGS-fdatasync.c): Likewise.
 	* sysdeps/unix/syscalls.list: Remove fdatasync from auto-generation
diff --git a/misc/Makefile b/misc/Makefile
index a777ece4a5..2db1fd8397 100644
--- a/misc/Makefile
+++ b/misc/Makefile
@@ -110,6 +110,7 @@ CFLAGS-err.c = -fexceptions
 CFLAGS-tst-tsearch.c = $(stack-align-test-flags)
 CFLAGS-msync.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-fdatasync.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-fsync.c = -fexceptions -fasynchronous-unwind-tables
 
 # Called during static library initialization, so turn stack-protection
 # off for non-shared builds.
diff --git a/nptl/Makefile b/nptl/Makefile
index 90eac7c7f2..eeadf4c425 100644
--- a/nptl/Makefile
+++ b/nptl/Makefile
@@ -220,6 +220,7 @@ CFLAGS-nanosleep.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-sigsuspend.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-msync.c = -fexceptions -fasynchronous-unwind-tables
 CFLAGS-fdatasync.c = -fexceptions -fasynchronous-unwind-tables
+CFLAGS-fsync.c = -fexceptions -fasynchronous-unwind-tables
 
 CFLAGS-pt-system.c = -fexceptions
 
diff --git a/sysdeps/unix/syscalls.list b/sysdeps/unix/syscalls.list
index c4135d8851..61e5360b4d 100644
--- a/sysdeps/unix/syscalls.list
+++ b/sysdeps/unix/syscalls.list
@@ -19,7 +19,6 @@ fchmod		-	fchmod		i:ii	__fchmod	fchmod
 fchown		-	fchown		i:iii	__fchown	fchown
 fcntl		-	fcntl		Ci:iiF	__libc_fcntl	__fcntl fcntl
 fstatfs		-	fstatfs		i:ip	__fstatfs	fstatfs
-fsync		-	fsync		Ci:i	__libc_fsync	fsync
 ftruncate	-	ftruncate	i:ii	__ftruncate	ftruncate
 getdomain	-	getdomainname	i:si	getdomainname
 getgid		-	getgid		Ei:	__getgid	getgid
diff --git a/sysdeps/unix/sysv/linux/arm/localplt.data b/sysdeps/unix/sysv/linux/arm/localplt.data
index 8bc876dd03..19d3299d98 100644
--- a/sysdeps/unix/sysv/linux/arm/localplt.data
+++ b/sysdeps/unix/sysv/linux/arm/localplt.data
@@ -5,7 +5,6 @@ libc.so: memalign
 libc.so: raise
 libc.so: realloc
 libm.so: matherr
-libpthread.so: __errno_location
 libpthread.so: raise
 # The dynamic loader needs __tls_get_addr for TLS.
 ld.so: __tls_get_addr
diff --git a/sysdeps/unix/sysv/linux/fsync.c b/sysdeps/unix/sysv/linux/fsync.c
new file mode 100644
index 0000000000..ac4827bd5e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/fsync.c
@@ -0,0 +1,28 @@
+/* Synchronize a file's in-core state with storage device Linux
+   implementation.
+   Copyright (C) 2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <unistd.h>
+#include <sysdep-cancel.h>
+
+/* Make all changes done to FD actually appear on disk.  */
+int
+fsync (int fd)
+{
+  return SYSCALL_CANCEL (fsync, fd);
+}